Happy Pi Day!

My son's math teacher asked us to bring in pies for the kids to celebrate "pi day" by measuring the pies, calculating the area and circumference of them - and of course, eating them!

I opted to bake square pies as a joke of sorts, representing the formula Pi r squared ("pie are square") - but at the same time, because the pies were square, rendering the formula useless for finding their area.

And of course, I had to remind them that "pie are squared" is not grammatically correct. It would be either "pie is squared" or "pies are squared."